BMR Calculator: Resting Calorie Estimate
Estimate resting energy expenditure with the Mifflin–St Jeor equation using metric or imperial measurements.
Your inputs
Choose the units and assumptions that match your data. Example inputs are illustrative.
Your result
Enter your values, then choose Calculate.
Results are calculated in your browser. Display rounding does not change the underlying calculation.
Calculation breakdown
Method, assumptions and worked example
How it works
The Mifflin–St Jeor prediction is 10 × kg + 6.25 × cm − 5 × age, then +5 for the male coefficient or −161 for the female coefficient. Although commonly called a BMR calculator, the cited study predicts resting energy expenditure; it does not measure strict laboratory BMR.
Worked example
Using the male coefficient, age 30, 70 kg and 175 cm gives 700 + 1,093.75 − 150 + 5 = 1,648.75 kcal/day.
Using the result
Resting energy excludes most movement and exercise and is not an intake recommendation. Population equations have individual error; laboratory indirect calorimetry can provide a measured resting value. For adults only; not for children, pregnancy, breastfeeding, or individualized clinical nutrition. A clinician or registered dietitian can account for medical conditions, medications and athletic demands.
Frequently asked questions
Is BMR the same as maintenance calories?
No. Maintenance includes activity and other daily energy expenditure.
Which coefficient should I use?
The published equation has male and female coefficients. Its applicability to your individual physiology may need professional guidance.
Method review and references
Formula and content reviewed on 10 October 2026. Worked examples are hypothetical. Methods and assumptions are explained on each page. Health estimates are not clinical measurements; symbolic tools are for entertainment.